CVE-2026-40472
Critical
Description
In hackage-server, user-controlled metadata from .cabal files are rendered into HTML href attributes without proper sanitization, enabling stored Cross-Site Scripting (XSS) attacks.
SeverityCritical
CVSS9.9
Exploit probability—
ProductHackage-server
PublishedApr 23, 2026
First seenApr 23, 2026
Weakness typeCWE-79Cross-site scripting (XSS)
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| hackage-server | 0.1 | — |
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